And with privacy features for encrypted phone calls and text messages, it wouldn't look out of place in a Bond flick.

Advanced wi-fi security stops anyone snooping if you access the internet in your local Starbucks and, if the phone falls into the wrong hands, the device can be controlled remotely and hitting the self-desctruct button will delete all data.

If you don’t want anyone knowing about those "specialist" websites you enjoy browsing, the Blackphone has anonymous browsing built in.

You also get a 4.7-inch HD screen, 8-megapixel camera and 16GB of expandable memory.

SELF-DESTRUCT: The Blackphone's content can be deleted remotely [Blackphone]

Toby Weir-Jones, CEO of SGP Technologies, said: “We are excited to achieve this key milestone on schedule and ship a remarkable device to customers that is the result of an unprecedented combination of privacy and mobile innovations and visionaries.

“In a world where devices and apps increasingly offer features only in return for users’ personal or sensitive information, the pent-up demand for Blackphone shows there is strong, international demand for our brand’s devices and services that stand apart by placing privacy before all else.”

The phone is on sale now priced $629 (£380) and it seems popular as it’s already sold out.

But if your partner receives one of these in the post, we’re guessing they’ve either joined MI5 or they might have something else to hide...